16542561 has 16 divisors (see below), whose sum is σ = 26021888. Its totient is φ = 9147600.

The previous prime is 16542553. The next prime is 16542569. The reversal of 16542561 is 16524561.

It is an interprime number because it is at equal distance from previous prime (16542553) and next prime (16542569).

It is not a de Polignac number, because 16542561 - 2³ = 16542553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16542569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12055 + ... + 13356.

It is an arithmetic number, because the mean of its divisors is an integer number (1626368).

Almost surely, 2^16542561 is an apocalyptic number.

It is an amenable number.

16542561 is a deficient number, since it is larger than the sum of its proper divisors (9479327).

16542561 is a wasteful number, since it uses less digits than its factorization.

16542561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25452.

The product of its digits is 7200, while the sum is 30.

The square root of 16542561 is about 4067.2547252416. The cubic root of 16542561 is about 254.8008749201.

The spelling of 16542561 in words is "sixteen million, five hundred forty-two thousand, five hundred sixty-one".